$NetBSD$

--- src/VBox/Runtime/r0drv/netbsd/semmutex-r0drv-netbsd.c.orig	2016-07-07 07:08:46.967030335 +0000
+++ src/VBox/Runtime/r0drv/netbsd/semmutex-r0drv-netbsd.c
@@ -0,0 +1,218 @@
+/*  semmutex-r0drv-netbsd.c $ */
+/** @file
+ * IPRT - Mutex Semaphores, Ring-0 Driver, NetBSD.
+ */
+
+/*
+ * Copyright (C) 2010-2015 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define RTSEMMUTEX_WITHOUT_REMAPPING
+#include "the-netbsd-kernel.h"
+#include "internal/iprt.h"
+#include <iprt/semaphore.h>
+
+#include <iprt/asm.h>
+#include <iprt/assert.h>
+#include <iprt/err.h>
+#include <iprt/mem.h>
+#include <iprt/thread.h>
+#include <iprt/time.h>
+
+#include "internal/magics.h"
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/**
+ * Wrapper for the NetBSD (sleep) mutex.
+ */
+typedef struct RTSEMMUTEXINTERNAL
+{
+    /** Magic value (RTSEMMUTEX_MAGIC). */
+    uint32_t            u32Magic;
+    /** The NetBSD shared/exclusive lock mutex. */
+    struct sx           SxLock;
+} RTSEMMUTEXINTERNAL, *PRTSEMMUTEXINTERNAL;
+
+
+RTDECL(int)  RTSemMutexCreate(PRTSEMMUTEX phMutexSem)
+{
+    AssertCompile(sizeof(RTSEMMUTEXINTERNAL) > sizeof(void *));
+    AssertPtrReturn(phMutexSem, VERR_INVALID_POINTER);
+
+    PRTSEMMUTEXINTERNAL pThis = (PRTSEMMUTEXINTERNAL)RTMemAllocZ(sizeof(*pThis));
+    if (pThis)
+    {
+        pThis->u32Magic = RTSEMMUTEX_MAGIC;
+        sx_init_flags(&pThis->SxLock, "IPRT Mutex Semaphore", SX_RECURSE);
+
+        *phMutexSem = pThis;
+        return VINF_SUCCESS;
+    }
+    return VERR_NO_MEMORY;
+}
+
+
+RTDECL(int)  RTSemMutexDestroy(RTSEMMUTEX hMutexSem)
+{
+    PRTSEMMUTEXINTERNAL pThis = hMutexSem;
+    if (pThis == NIL_RTSEMMUTEX)
+        return VINF_SUCCESS;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertMsgReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
+
+    AssertReturn(ASMAtomicCmpXchgU32(&pThis->u32Magic, RTSEMMUTEX_MAGIC_DEAD, RTSEMMUTEX_MAGIC), VERR_INVALID_HANDLE);
+
+    sx_destroy(&pThis->SxLock);
+    RTMemFree(pThis);
+
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(int)  RTSemMutexRequest(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies)
+{
+    PRTSEMMUTEXINTERNAL pThis = hMutexSem;
+    int                 rc;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertMsgReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
+
+    if (cMillies == RT_INDEFINITE_WAIT)
+    {
+        sx_xlock(&pThis->SxLock);
+        rc = VINF_SUCCESS;
+    }
+    else if (!cMillies)
+    {
+        if (sx_try_xlock(&pThis->SxLock))
+            rc = VINF_SUCCESS;
+        else
+            rc = VERR_TIMEOUT;
+    }
+    /*
+     * GROSS HACK: poll implementation of timeout.
+     */
+    /** @todo Implement timeouts in RTSemMutexRequest. */
+    else if (sx_try_xlock(&pThis->SxLock))
+        rc = VINF_SUCCESS;
+    else
+    {
+        uint64_t StartTS = RTTimeSystemMilliTS();
+        rc = VERR_TIMEOUT;
+        do
+        {
+            RTThreadSleep(1);
+            if (sx_try_xlock(&pThis->SxLock))
+            {
+                rc = VINF_SUCCESS;
+                break;
+            }
+        } while (RTTimeSystemMilliTS() - StartTS < cMillies);
+    }
+
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(int) RTSemMutexRequestDebug(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies, RTHCUINTPTR uId, RT_SRC_POS_DECL)
+{
+    return RTSemMutexRequest(hMutexSem, cMillies);
+}
+
+
+RTDECL(int)  RTSemMutexRequestNoResume(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies)
+{
+    PRTSEMMUTEXINTERNAL pThis = hMutexSem;
+    int                 rc;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertMsgReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
+
+    if (cMillies == RT_INDEFINITE_WAIT)
+    {
+        if (!sx_xlock_sig(&pThis->SxLock))
+            rc = VINF_SUCCESS;
+        else
+            rc = VERR_INTERRUPTED;
+    }
+    else if (!cMillies)
+    {
+        if (sx_try_xlock(&pThis->SxLock))
+            rc = VINF_SUCCESS;
+        else
+            rc = VERR_TIMEOUT;
+    }
+    /*
+     * GROSS HACK: poll implementation of timeout.
+     */
+    /** @todo Implement timeouts and interrupt checks in
+     *        RTSemMutexRequestNoResume. */
+    else if (sx_try_xlock(&pThis->SxLock))
+        rc = VINF_SUCCESS;
+    else
+    {
+        uint64_t StartTS = RTTimeSystemMilliTS();
+        rc = VERR_TIMEOUT;
+        do
+        {
+            RTThreadSleep(1);
+            if (sx_try_xlock(&pThis->SxLock))
+            {
+                rc = VINF_SUCCESS;
+                break;
+            }
+        } while (RTTimeSystemMilliTS() - StartTS < cMillies);
+    }
+
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(int) RTSemMutexRequestNoResumeDebug(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies, RTHCUINTPTR uId, RT_SRC_POS_DECL)
+{
+    return RTSemMutexRequestNoResume(hMutexSem, cMillies);
+}
+
+
+RTDECL(int)  RTSemMutexRelease(RTSEMMUTEX hMutexSem)
+{
+    PRTSEMMUTEXINTERNAL pThis = hMutexSem;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertMsgReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
+
+    sx_xunlock(&pThis->SxLock);
+    return VINF_SUCCESS;
+}
+
+
+
+RTDECL(bool) RTSemMutexIsOwned(RTSEMMUTEX hMutexSem)
+{
+    PRTSEMMUTEXINTERNAL pThis = hMutexSem;
+    AssertPtrReturn(pThis, false);
+    AssertMsgReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), false);
+
+    return sx_xlocked(&pThis->SxLock);
+}
